Issue 35

W. Ozgowicz et alii, Frattura ed Integrità Strutturale, 35 (2016) 11-20; DOI: 10.3221/IGF-ESIS.35.02

Figure 12 : Intercrystalline brittle fractures of the CuSn6P alloy after stretching at the temperature of 400°C.

Figure 13 : Intercrystalline brittle fissures at the contact point of three grains of the CuSn6P alloy after stretching at the temperature of 400°C.

CONCLUSIONS

he obtained results of investigations concerning the mechanical properties of industrial tin bronze CuSn6P at elevated temperature of deformation, applying the AE method and the performed structural and fractographic, analysis of the influence of temperature of deformation on the PLC effect and the intercrystalline cracking of the alloy permit to draw the following conclusions: 1. The PLC effect, which is characteristic for the phenomenon of heterogeneous plastic deformation of the investigated alloy turne up in the course of tensile tests at the equicohesive temperature (T E ) of about 250  C up to the minimum temperature of plasticity (TMP) amount to about 400  C. 2. The effect of the instability of plastic deformation PLC of the investigated alloy depends considerably on the temperature of deformation and its maximum is attained at the temperature of stretching amounting to about 250  C. 3. Within the range of temperature of the tensile test (20 to 400  C) the strength of the alloy (R m ) and the value of the reduction in area (Z) decrease much, (R m ) from about 350 MPa to about 180 MPa and (Z) from about 70% to about 10%, respectively, independently of the state in which the alloy has been delivered. T

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